Rene Furterer Complex 5 is the basis of the René Furterer method. To obtain beautiful healthy hair, you need to treat the scalp. Complex 5 is a concentrate of essential oils which help purify the scalp and make it receptive to the action of treatment products. Do not wet hair. Apply Complex 5 to the scalp, parting the hair into different sections. Massage in gently and leave for 10 minutes. Follow with your special René Furterer shampoo and conditioner. Use once a week. Note: Complex 5 has a warming effect, which may cause a tingling sensation, a normal reaction which will disappear quickly. However, this is why it should not be used on an irritated scalp